A study was conducted to offer a preliminary understanding of the role played by intensively used field controlling agents, two mineral oils, namely Alboleum and Super Misrona oils as well as an IGR, Admiral (pyriproxyfen) with the recommended doses upon adult female mealybug Ferrisia virgata (Pseudococcidae: Homoptera) as an arbitrary model for mealybugs. The present work points out to the importance of the delayed effect of these different compounds. The highest increase in the total protein content was achieved by Admiral reached 29.2% while Super Misrona caused the greatest enhancement in the total carbohydrates concentration (72.93%). On the other hand, Alboleum caused a highly significant inhibition in the activity of glutamic oxaloacetic transaminases (GOT) and glutamic pyruvic transaminases (GPT) reached 82.03 and 22.10 %, respectively. These biochemical changes were intensively discussed. Among most of the tested biochemical parameters, Admiral showed the strongest delayed effect.

The present work was conducted in Qalubyia Governorate during 2010 to control the potato tuber moth, Phthorimaea operculella (Zeller) (Lepidoptera: Gelichiidae) in rustic farm storage and potato fields. Results showed that, double release of the parasitoid, Trichogramma evanescens Westwood and the predators, Chrysoperla carnea (Stephens) and Orius albidipennis (Reuter) were effective as biological agents against P. operculella under straw-cover heaps. The highest reduction percentage occurred with application of both T. evanescens and C. carnea, they reduced the infestation to 75.56% whereas application of both T. evanescens and O. albidipennis reduced the infestation to 56%. Application of O. albidipennis alone gave poor reduction percentage (5.1%). One release of O. albidipennis reduced the infestation to 21% in the field. However, application the agronomic cultural practices reduced rate of infestation to 45% at the trail end in the storge.